Intangible Assets - Summary of Break-Up for Goodwill and Intangible Assets (Detail) - USD ($) $ in Millions |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Ostro Energy Group [member] | Wind Power Segment [Member] | ||
| Disclosure of information for cash-generating units [line items] | ||
| Goodwill | $ 9,903 | $ 9,903 |
| ReNew Vayu Urja KCT [member] | Wind Power Segment [Member] | ||
| Disclosure of information for cash-generating units [line items] | ||
| Goodwill | 756 | 756 |
| Prathamesh Solarfarms [member] | Solar Power Segment [Member] | ||
| Disclosure of information for cash-generating units [line items] | ||
| Goodwill | 428 | 428 |
| Others [member] | Wind Power Segment [Member] | ||
| Disclosure of information for cash-generating units [line items] | ||
| Goodwill | 145 | 145 |
| Others [member] | Solar Power Segment [Member] | ||
| Disclosure of information for cash-generating units [line items] | ||
| Goodwill | $ 364 | $ 364 |